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Plasma

I would go with the extreme , smaller case, more portable,same overall power , but it looks like the extreme has faster cut speed on 3/8 steel...dont know how thats possible?
The standard 375s case seems to be more exposed to debris and really archaic as far as case design . The main difference is price.

Comment

Biggest difference is in the performance when operating on 110. The 375 would continually trip a 20 amp breaker, even on very low settings where it should have been able to operate. The 375X has fixed that problem. Overall, it's a better machine.

Comment

Had a Hobart 400 airforce and upgraded to Miller 375, same exact machine just different color. Use on mobile repair truck so upgraded to 375 xtreme with ICE27 torch. Both machines work very similar, always better on 230v but very impressive. Inverter style seems fragile compared to old transformer style, hopefully will never drop it to test durability.